Brush-holder for commutators.



No. 634,804. Patented Oct. l0, I899.

, W. H. WARREN &. C. A. MUDGE.

W. COOPER BRUSH HOLDER FOR COMMUTATORS.

(Application filed May 18, 1898.) (N o M o d e l N wve/wbow u ww UNITED STATES PATENT OFFICE.

WILLIAM COOPER, \VILLIAM H. WARREN,- AND CHARLES A. MUDGE, CF

CINCINNATI, OHIO, ASSIGNORS TO THE BULLOCK ELECTRIC MANU- FACTURING COMPANY, OF SAME PLACE.

.BRUSH-HOLDER FOR CQMMUTATORS.

SPECIFICATION forming art of Letters Patent N 0. 634,804, dated October 10, 1899.

Application filed May 18,1898.

T0 to whom, it may concern:

Be it known that we, ILLIAM Coornn, WILLIAM H. WARREN, and CHARLES A. MUDGE, citizens of the United States, and residents of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain newand useful Improvements in Brush-Holders forElectric Com mutators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. Our invention relates to an improvement in brush-holders for electric commutators, its object being to construct a brush-holder for carbon or any non-metallic electrical conductors and at the same time operative with a metallic electrical conductor. It is to provide a simple holder easily accessible for the purpose of removing or changing the brush and adjustable for regulating the pressure and also the angle of contact between the brush and the commutator.

The invention, with certain mechanical modifications, is illustrated in the accompanying drawings.

Figure 1 is a rear elevation of the holder when the hinged arm is made bifurcated. Fig. 2 is a vertical cross-section of the same. Fig. 3 is a rear elevation of the bifurcated swinging arm. Fig. 4 is a side elevation of the same. Fig. 5 is a side elevation of the thumb-piece by which the end of the spring is held to the arm and its tension changed. Fig. 6 is an elevation of the same.

Like letters of reference indicate identical parts in all the figures.

Ais the commutator, and B the brush,which consists of a block of electrical conducting material, such as carbon or copper, and we prefer to have its opposite ends beveled toward each other, though the end away from the commutator may be merely notched to re ceive the end of the swinging arm C. A castingD is journaled on a suitable bearing passing through the opening D and forms, prop- Serial No. 681,009. (No inodelil erly speaking, the seat forthe block of carbon B. This block of carbon, resting upon the smooth flat surface B, is slidable over this surface. The holder is provided with a set-screw F, by which the angle of the flat seat B may be changed and adjusted with relation to the commutator. The face of this flat seat I3 extends to within a short distance of the face of the commutator, the carbon or brush l3 resting upon it and extending beyond it against the face of the commutator. \Ve prefer to place the holder so that the extreme end of the seat B will be below the plane passing through the axis of the commutator and the angle at which this seat is placed, such that pressure of the commutator upon the carbon will tend to hold it down upon its seat no matter which way the comin utator is revolving.

To the lower end of the casting or holder is journaled a curved bifurcated arm C, the lower end being journaled at c and the upper end curved round, so that it may press against the outer end of the brush B. To hold this arm C against this brush, we provide the coiled spring E. One end of this spring is fixed to the holder at E. The opposite end is attached to the swinging curved arm 0 by the thumb-piece I. This thumb-piece P is held between the bifurcations of arm C by detents or pawls p on the thumb piece, which take into notches 1') of the arm C, and the thumb-piece is held in place by the tension or pulling of spring E. 13y pulling on the thumb-piece I and disengaging the pawls p from the notches p the thumb-piece can be applied at different distances from the pivotal point of the arm, and thus the pressure of the arm on the carbon varied.

Having thus described our-invention, what we claim, and desire to secure by Letters Patcut, is

The combination with a commutator, of a block of carbon or other electrical conductor, one of its beveled ends lying against the commutator, n Ila-t and adjustable cendueil- 1 end of the arm against Lhe brush, subst2u1- IO ing-plate upon which the block rests and is tinny as and in the manner described. i iiovable, a QIVOEGQ PlilillCELtGd arm \whese VILLIAM COOPER.

iee end beais against hhe othei end of M16 TILT 1AM H ,ARREN 5 brush, and provided with notchesin its bifnr- I f- Fq MUDOF cations, a thumb-piece provided with pziwls 1 which engage in said notches, and a coiled spring Whose normal tendency is to hold said thumb-piece in Contact with the arm and one Witnesses:

ALBERT G. WEssLmc, GEORGE IIEIDMAN. 

